MIC33050 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – 4MHz Internal Inductor PWM Buck Regulator with HyperLight Load™

MIC33050
4MHz Internal Inductor PWM Buck
Regulator with HyperLight Load™
General Description
Features
The Micrel MIC33050 is a high efficiency 500mA PWM
synchronous buck (step-down) regulator with internal
inductor featuring HyperLight Load™, a patent-pending
switching scheme that offers best-in-class light load
efficiency and transient performance while providing very
small external components and low output ripple at all
loads.
The MIC33050 also has a very low typical quiescent
current draw of 20µA and can achieve over 83% efficiency
even at 1mA.
In contrast to traditional light load schemes, the HyperLight
Load™ architecture does need not trade off control speed
to obtain low standby currents and in doing so, the device
only needs a small output capacitor to absorb the load
transient as the powered device goes from light load to full
load.
At higher loads, the MIC33050 provides a constant
switching frequency of greater than 4MHz while providing
peak efficiencies greater than 93%.
• Input voltage: 2.7V to 5.5V
HyperLight Load™
• 500mA output current
• Fixed output voltage options from 0.72V to 2.5V
• No external inductor required
• Ultra fast transient response
• 20µA typical quiescent current
• 4MHz in PWM in constant current mode
• Low voltage output ripple
– 25mVpp in HyperLight Load™ mode
– 3mV output voltage ripple in full PWM mode
• >93% efficiency
• >83% at 1mA
• Micropower shutdown
• 3mm x 3mm MLF^®-12L
• –40°C to +125°C junction temperature range
Applications
The MIC33050 comes in fixed output voltage options from
0.72V to 2.5V thereby eliminating external feedback
components.
The MIC33050 is available in an 12-pin 3mm x 3mm MLF^®
with a junction operating range of –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Cellular phones
• Digital cameras
• Portable media players
• Wireless LAN cards
• WiFi/WiMax/WiBro modules
• USB Powered Devices
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Typical Application
HyperLight Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
October 2007
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M9999-100407-A